Meanwhile the price of a home nationwide increased by 10% in the year to September.
That's a marginal drop in the rate of increase, compared to the previous month.
The CSO's Residential Property Price Index shows the cost of a home rose by 10% in the year to September, down slightly from 10.1% in the 12 months to August.
In Dublin, prices rose by 10.8%, while outside the capital, they went up by 9.4%.
The region outside Dublin that saw the largest rise in house prices was the border, that's Cavan, Monaghan, Donegal, Leitrim and Sligo, where they rose by 15.3%.
While at the other end of the scale, the Mid-East - that's Kildare, Louth, Meath, and Wicklow - saw a 7.5% rise.
The median price paid for a home in the year to September was €346,000.
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